The value
{ROW(1,NULL,2,NULL,'a',true,NULL,NULL,NULL,NULL,NULL,NULL,NULL)}
represents an array of a register. The braces surrounding ROW(...)
indicate that the value is an array. Without the braces, it would be a
register.

The URLs above are not escaped to make the examples more
clear. However, take into account that the HTTP clients have to escape
the values of all the parameters. For example, if you want to invoke
this URL: